An episode of Christmas University Challenge has been pulled after two contestants complained about a lack of provision for their disabilities.
One of the contestants, who is blind, called the experience "distressing".
Audio description, which they said had been promised, was not provided, while a request for subtitles for another contestant, who is neurodivergent, is understood to have been turned down.
The BBC said it had apologised to the individuals concerned.
The show's production company Lifted Entertainment, which is part of ITV Studios, also offered its "sincere apologies".
Christmas University Challenge, a festive spin-off from the BBC Two quiz show, features teams of distinguished alumni who compete on behalf of their former universities.
BBC News understands that the two contestants flagged disabilities to the producers before the recording.
It is understood that the production team said subtitles were not possible but that audio description would be provided. However, in the event, audio description did not happen.
'Distressing'
One of the affected contestants said: "One minute before the show, we were told there was no audio description and that your captain will instead have to explain everything."
The contestant said the visual images, which needed describing, included a pie chart and maps. "It was distressing," they added.
The other contestant, who is neurodivergent and has challenges with audio processing, said they had requested subtitles in advance so they wouldn't be at a disadvantage when trying to answer questions at speed.
"Unfortunately, I was told this wasn't possible," they said.
They still agreed to participate, but said the experience was "overwhelming and overstimulating", and that it impacted their ability to function for a week afterwards.
After the show was recorded, the two contestants - who have asked not to be named - complained to the BBC and asked for the episode not to be broadcast.
"I was in touch to say I'd prefer not to have the manifestation of my disability broadcast on network TV in the run-up to Christmas," the first contestant said.
On Friday, the decision was made to pull the episode.
